Airworthiness Directive 2001-17-33
one-timeAirworthiness Directives; Agusta Model AB412 Helicopters
What this AD requires
This amendment adopts a new airworthiness directive (AD) for Agusta Model AB412 helicopters. This action prohibits use of the hoist until certain modifications are accomplished. This amendment is prompted by the loss of a hoist hook during flight due to an uncommanded firing of the cable cutter cartridge caused by wire chafing. The actions specified in this AD are intended to prevent wire chafing, inadvertent firing of the cable cutter cartridge, loss of a hoist hook and section of cable, impact with the main or tail rotor, and subsequent loss of control of the helicopter.
Which aircraft AD 2001-17-33 applies to
Excerpt is the standard cross-reference paragraph ('...each helicopter identified in the preceding applicability provision...'); the actual model/serial applicability list precedes this excerpt and was not captured. Requires inspection/modification of the hoist wire harness per Agusta Alert Bollettino Tecnico 412-83, Revision A, dated December 29, 2000, to prevent wire chafing and inadvertent firing of the hoist cable cutter.
Whether AD 2001-17-33 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.